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How many electrons are in an atom of O2-.

  • chem -

    I have a problem picturing and atom of O-2. I can picture an ion but not an atom.

  • chem -

    yes ion.

  • chem -

    There are 8 electrons in an O atom so there must 16 electrons in two O atoms. It has a -2 charge; therefore, it must have two more electrons in excess.

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